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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932af75807cdeb43824357d9414b3a3196837a073856726a49e21ecd62a79867' 
  AND token = 'FtiueUSD8c2gfcm9bGKc5xx9Bsi9X7Vx7aQLhk23wF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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