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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e007aa51f749d9e5f585db83f1f2191322ae4c618bd3b0040dbea1aed2a3fd' 
  AND token = 'FFAhbQcW4uJwln37lDQoqnSncmxVTt0oXnhFa7WwJLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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