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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b1c0d7051c17b670403c4b7941cbdf2b4b26188f1c24f51c2ae1a8f54fb916' 
  AND token = 'vaRzZanI/SE3n98U8vYMFOzJErIsWkZTIeenzKZL7F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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