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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409eb4613c1b171b65711783fd6d40ea22fb5ff9886722a401054d7c0c2cdac0' 
  AND token = 'T/b4q6A4suWz/AD1NPlZ9jx6OyfplyQpoLXYgqPOmJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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