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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4470b8f792b5b2c0399b22a0e875b40719ea89a353230d5d26e58bcf716c4826' 
  AND token = '9viK4n1+J2s4ND6fjMW7V1KekelCkyBQ4tNZn6zZsF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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