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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce265921c7f9b6dfab2d6029484048f885b41744e3956938e8def3d8555e3b27' 
  AND token = 'GrBYWPIopgTE7O8/OCzXpTpO/SaABwa44enSCPGOs+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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