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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f4130b6a226ae5a26b02b2c8fb9229cf5bf402212b6501a0474ec0d4af10a81' 
  AND token = '/3jybE5WnbII/uPFKbbwubR/N7Sls738ILItwBHOoow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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