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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb96fc7c14e5182fe92594bff916aa83e6cee40a334cfd5cf7712f4c40e5a15' 
  AND token = 'MQBK+NkmumdlhCrPcjyUv+h/FNug5+4keWv4bD6b3Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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