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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71700cff93019968964dc3bd1020d1adc55ea1779fbc84e96d60005d3e8347cc' 
  AND token = 'dtQBW439gmjMbqY/A5CR+63Cm4Hwn0GR5t2spTWay5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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