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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf033cc9a3a50636a0284fa52c5258b2e2c5ec25b350e25e8a44dbe77923da1' 
  AND token = 'J/Tz0slsWMaovjoTc1wGuO1DUVnamGfjpvJDHUIWmwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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