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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef77d97e73a150887a9afcd540fd325da950d8fe4f5e17d3347382a130f5652f' 
  AND token = 'yCcZQ5jOdwP6LdWW5VqprFs81av5MjzSEsAUk5ljT78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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