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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dec328c326128016430101a2e4e7f40bdbb08f3b7eac05072b1507243f8641b' 
  AND token = 'ieoP152q5ys3WwUC3RYFGmrsHBiCskFb9j9OnJsmE/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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