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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d71e5ee918f1451c187eadc973ab7f65b4d46c691d28dc90fcf2552f6503c31' 
  AND token = 'b9ohTO7j3pQOxCU7oO6eYkSVxKY5dWvE7l+SZ4rsSMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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