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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2cf8b2d7a9258d2d178882446dedfbf88f5864f26dc519a070c770b2c20c5b6' 
  AND token = 'qe52U4+U2UAo0azN0fCHwh2O+5lIGLcQsu8CuHCSyiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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