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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed72889e1d7440c1a4ffe685d421ccb545d2afd63e13b4ed427b71aeeb924ef' 
  AND token = 'QfsOylgc/8KYRSOljseABd+fUh9Z2uqtNEYmbjrqOA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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