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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9234766501f9bc80d166b741e59520b5bb4f5baac769bd3fcb9d45bda7456b66' 
  AND token = '/6c/2hhYMwVeZj9T8QX8/t4782apm8DjJu/1RAWHBYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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