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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308c87f7bd1b26aa49f4c76d8a2e6fd8075252c89600b1a6ef73b825fc0b8666' 
  AND token = 'YxQPokXhQa0Hlq8Wz+I6MPEIn/ukbUT6yZJS6zKGNOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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