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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9579737592005b7cdbc65ad28a185e6f56472ec1ebd742e3540367e174d868' 
  AND token = 'ZAO85JTls4VoNJiJhufIgZ4s69TgHJLyr7GLQZ6E7hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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