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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c344da230b9b3036e684d047cda043d56fa7279698ceb1567f3150f4b4f845' 
  AND token = '3Zf+s21kAL7ZcA+jRjRyx7gUJuSRowlHMeuftic23SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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