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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a5879f8e6dd5ab35e479f1db36b42a9568c5cc5f5177d2a4d65cd661346d37' 
  AND token = 'EM8CYxtKS6odG0+4dLEBEzhNms5OZdZnHzCQG5cBmAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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