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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f4b718733809ecac494a039cb6eb6566662c3580d69c2b1d95e2892a29e3f2' 
  AND token = 'n/an0kDPLZZI5a6UqK8g0xgT25dzaIJud+bfN3QTT2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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