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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fae470aae27e912ffb146ca2b33fdc68c1ffbc2a90e882630192dcd975c084' 
  AND token = 'koVuQkgmseEP28vPv2RKazCWcAboPkSOwwd3j5z1FCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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