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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '354dcf3868fce6b21db712ffa67e5fbc45ce2370c5d54b5ad07a90a1d65c98a3' 
  AND token = 'yNWeenotTj2UrcwkL98jFVcGMvsWaO1lIVm++N+1stM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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