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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f3a2457e0388e719d5b78cebfd7c239dc89dd3c0d8d4f75ebf307d8c2411bb' 
  AND token = 'EIX4E/RZzprXFJV3UrofogJFytoM4vLAiuST3omGvpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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