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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b52f7a020e66b62da12eddddd349ca11a1156c8f27e61f401ad052b04ddfa15' 
  AND token = '36kKH62Z/Fus7aPrkLJ/y+7WJofl/qJdhWrDRb3e7AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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