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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117e3b8ba8fe010d7f7a666161800c1e216acf003e3e9687f5f80df0f6b9e63c' 
  AND token = 'hzsy0qXEJUPz6nNMyC7kIeOyWRShFRTac+b1YOopXBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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