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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9297ace472649c8c87ae1bda9d1d63e783563946c7662c971e5216ee5cb65e' 
  AND token = 'YKUehsb4imlujhl4bHzmKAlB5R10T9qhUjyqbtkKkf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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