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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66f8592f6279b5af85614145a27ffe207ee40f011dea090acf39e54de29441b6' 
  AND token = '12Zq6qFLbrP+6Zl2EWye7oUoRUunDUm7YsGLsZfP7TQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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