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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6499f6bb8e3e97602213772777ad6427377ab19ad78671e99f9c007b5a86eb0e' 
  AND token = 'psG3H5/Z7IuMOtv6otlsbPWmxslL+DJsQmKLULJQ76I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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