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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084289159a27d2f87c9f380bd9500dc74e11fc6e4fe539a8e22c6d5c9c5322a5' 
  AND token = 'Ht2kQwrTltPg8wCF5uFTcMNufihGNKriFiT8Zgpd35o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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