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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '412c29e11d831c014ada4072e40e0e7733d2503e9d4d2bc7fbdf01ed884b61ce' 
  AND token = 'yumpbraIsCmEfqvh0Kumt+hfip+gfUp2S8V80umSyGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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