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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ff2d25ce2e33b3ef02e48b0ca2ce4f49270f5c3cc52d9118aa8c297a456c5c' 
  AND token = 'FWJir3YlZ6DWIky9Mvdy9LugkHtnLVCfRprJM4T1rRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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