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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe480017f8b414417192091a89ec43c7883a6dd2f2c066fb63a56086401c3f1c' 
  AND token = 'ALlQRt+dExzAjQP0MHrSJDqJJipG6AXTfGDd+8n0WK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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