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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760992856fea7598b7d3137a773ae9a6e73ab7e6537060e7de9a041dac05d8d3' 
  AND token = 'UP2Cik/o20fZxUxPouT38i/9AVCAlA8hjAhfOkTOtlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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