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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47657106f285101a3d7f6f2841ab847e2eed980fcd263d901d0e2ea3fa0a7b61' 
  AND token = '4oEmy62Nj09SAPvLEiu+rpD0LM22itUX1oZHysjWW7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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