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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88665a2c4ea2f714a08cc2c1f35358d33dc0d5e790c8023e7bb85acbd1ef6766' 
  AND token = 'cPGQzpJR1CGUcrb612z6IGxL2R33PaKlDnfhD1MkpbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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