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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5bb35da933bcd3ad7d38b0da8cbf01faea4922b09888d9eefd1f6fbaa2cab44' 
  AND token = 'uJiC9j6MWOT2W4yCLFwIzD2lUBeVjK2HLC1/PssGEVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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