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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4343f6bb11688be53860642cce2d86323560038049452fe3dadcc6f119c5b8f5' 
  AND token = 'YmkGiEcP4fdHxdv3O5RD7ZZ91lK1HSo9T849+Gz+a4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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