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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d8245c5979d13ac04c1f5f9ea84c09997b3638eb6b1d011578adce92a507c2b' 
  AND token = 'gKKLxrlTvIAcv+DaivPnKY+cGiMj9LwhlmrlL0TndSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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