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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96dbf8033a22e0833207a845d19f02b9ba86ad84329ff2ce5b5ad72be9140bee' 
  AND token = 'KVTDADf5uww8zoA/mVtcS8I7w2lyLNnBt9KRM8feZU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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