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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100b49b1b7b12fac4e45e68089f78bc39059c1221496aed708d10c1839917323' 
  AND token = 'u8oTNy47wMO+OaAyQUHDrgBMNDDRF4lWlZ0iLfREmGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}