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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ac734a769f8694b468cad3e7d506423219c57fd45f645b108ea689c90b9db6' 
  AND token = 'lK7LEJHz6aKlU+xbVYn63etASHO/ic8Z3ofAJt0IU2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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